Alizarin sulfo-acid and process of making same.



mmmsnll mir wi l UNITED STATES PATEN T OFFICE.

MlCHAEL JLJINSKY, 0F OREFELD, GERMANY, ASSIG NOR TO R. WEDEKIND & 00., ()F UERDINGEN, GERMANY.

ALIZARIN SULFO-ACID AND PROCESS OF MAKING SAME.

Specification of Letters Patent.

Tatented July 17, 1906.

Original application filed July 14,1903, Serial No. 165,426. Divided and this application filed November 18, 1904. Serial No. 233,358.

To nil whom it Tnay concern:

Be it known that 1, MICHAEL JLJINSKY, chemist, s subject of the Russian Emperor, and a resident of 7 Sudstrasse, Crefeld, in the German Empire, have invented a new Alizarin Monosulfonic Acid and Production Thereof, of which the following is a, specification.

In my application, Serial No. 165,426, filed Jul 14, 1903, I have described a process of sul ousting enthraquinon or other organic bodies, especially anthrecene derivatives in the presence of mercury, (as such or in the form of mercury compounds,) by which process the sulfur group or groups enter in other positions than by the sulfonsting recess only by means of sulfuric said. here found that by this process a new elizariu monosulionic acid can be obtained by treating the elizsrin with fuming sulfuric acid in the presence of mercury (as such or in e combined state) as may be illustrated by the following example: Twenty parts of elizsrin, 0.4 arts of mercury sulfate, and one hundrecl p arts of fuming sulfuric acid of twenty per cent. free S a are slowly heated to about 115 centigrade and kept at this temperature so long until the product is solu' his in. water. The alizerin monosulfonic acid formed is different from that otherwise obtained under the same conditions without addition of mercury. Vlhile the known acid from acid solution is precipitated by common salt, the nciv sliznrin monosulfonic acid can only be precipitated from acid solution by means of chlorid oi potassium.

The new acid gives u cnrininn-colored potassium salt, which sliilcrs materially from the notes-shun salt ol' the known nliznrin llh' may lll. scfln from tilt. i ullnwinit lnble.

characterized by having the sulionio 3 Salt of known acid l Salt of new acid m. or i l .t Appearan e "v i Orange-yellow Carmine Watery SUflltl TL: Yellowish rvd l Dark red. Soluhllityin KC! 1 time gram is nearly Une ram is lmmedi solution. insoluble in thirty atey dissolved by cubic centimeters hes in thirty enhic of solution of pocei ,imeters of solutassium chlorid of 1 tion of potassium ten per cant, even 1 chlorid with dark in the heat. redcolor. Tires-clution gelstinizes in cooling. Behavior of the Itisimmedlatelysep- The solution is co]- watery solumated a purple cred purple,evenin tion with sul- X violet precipits f n te of copper. tion.

* higher concentra- Dyeings: Wool mordented with chromiuni and dyed with the new acid keeps the color better than such wool dyed with the known acid. The new elizcrin monosulfonic acid is to be used as dyestuil or as material for producing other dyestuffs.

I claim as my invention 1. The new alizarin nicnosulionic acid group in new position and giving e csrmine-colored otessiumselt dissolving with dark-red color in water and immediatel Y in hot potassiumchlorid solution, which latter solution gelatinizes in cooling, the watery solution of'this potassium selt giving with sulfate of copper a. purple-colored solution even in higher concentretion.

2. Process oiproducing the described elizerin monosull'onrc acid, consisting in reacting on alizsrin with fuming sulfuric acid in the )resence of mercury, substantially as end or the purpose set fort In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

MICHAEL JLJINSKY. lvitnesscs \V. Buyer: VVALLAGE, All in A lu-z'r W'ALLAGE. 

